Control for jarring molding machines



Dec. 24, 1929.

CONTROL D. J. CAMPBELL FOR JARRING MOLDING MACHINES Filed Dec. 10, 19244 Sheets-Sheet l A WA r z 35 -a9' 3.1 o

' 1 16 ,g Inuznror Dona\ J-GQmPbQ 1929. D. J. CAMPBELL ,7

CONTROL FOR JARRING MOLDING MACHINES Filed Dec. 10, 1924 4 Sheets-Sheet4 Inveni'ov 'Doncfld J. Campbell Patented Dec. 24, 1929 DONALD J.CAMPBELL, OF MUSKEGON HEIGHTS, MICHIGAN CONTROL FOR JARRING MOLDINGMACHINES Application filed December 10, 1924. Serial No. 754,930.

This'invention relates to a machine to be used in molding, and isparticularly directed to mechanism automatically operated by compressedairand constructed for elevating and letting fall repeatedly a table orram 0n which a flask with a pattern and sand therein may be located, sothat the sand within the flask and around the pattern may be condensedto the proper density, the operation in eflect being a jarring of sandin a flask to the necessarily condensed form wherein it will be suitablefor a mold. It is an object and purpose of the present invention toprovide a construction which will serve to produce this jarring at closeintervals after it is once started, and which after a predeterminednumber or cycles of operation automatically stops and remainsinoperative until again started. Many novel details of con struction andcombinations and arrangements of parts for effectively attaining theabove described effects are provided in-the construction, one embodimentof which is shown in the accompanying drawings, in which, I

Fig. 1 is a vertical section through the molding machine made inaccordance with my invention.

Fig. 2 is a horizontal section taken substantially on the plane of line22 of Fig. 1.

Fig. 3 is a vertical section through the automatic valve mechanismforming a part of my invention, the valve being shown in upper position,

Fig. 4 is a view similar to Fig. 3, the valve being in lower position.

Fig. 5 is a horizontal section taken substantially on the plane of line5'5 of Fig. 3.

Fig. 6 is a like view on the plane of line 66 of Fig. 3.

Fig. 7 is a fragmentary side elevation of the ratchet mechanism used totime the stopping of the jarring of the machine.

Fig. 8 is an elevation of one'type of ratchet disk which may be usedwith said mechanism.

Fig. 9 is a horizontal section substantially on the plane of line 9-9 ofFig. 3, and

Fig. 10 is a fragmentary side elevation of 50 the lower part of themachine where said .A piston 4 is located within the cylinder 3automatic valve mechanism is attached, the valve mechanism beingremoved.

Like reference characters refer to like parts in the difl'erent figuresof the drawings.

In the construction a heavy base 1 is pro- 5 vided from which a cylinder2 extends vertically for a distance, the same at its upper end beingenlarged and continued upwardly as a larger cylinder 3, as shown in Fig.1.

O0 and equipped with ring packings,from which a smaller piston 5 extendsdownwardly inside of the cylinder 2, it also near its lower end beingequipped with packing rings to hold the compressed air which isintroduced under the lower end of the piston 5 as will later appear. Ahead 6 is connected to the upper end of the piston 4, in turn carrying amember 7 and a board 8 on which the pattern 9 is placed with a flask 10around the same,

the sand 11 being disposed within the flask and around the pattern.

At one side of and near the lower end of the cylinder 2, a valve casingis located and firmly secured, including a lateral portion 12 integralwith which is a vertical valve casing 13, the same being bored from itslowerend upwardly nearly at its end to make an elongated cylindricalopening 14 therein, the lower end of which is closed by a screw plug 14.A horizontal passage 15 is made through the lower part 12 joining at itsend with a passage 16 made through the cylinder wall 2 at the extremelower end of the cylinder, as shown in Figs. 1, 3 and 4. An outlet 17 ismade through the valve casing 13 at the upper end of the opening 14, anda hose connection 18 is made with suitable fittings, one of which screwsinto the outlet opening 17 and the other of which may be screwed intoany one of a series of horizontal openings 19 made at diflerent levelsthrough the adjacent wall of the cylinder 2, all of the openings eirceptthe one with which the hose 18 is associated being securely closed byplugs 20.

In the opposite side of the valve casing 13, a relatively smallhorizontal passage 21 is provided a distancebelow the upper end of thecylindrical opening-.14, and at the upper end of said opening 14 anddirectly opposite the outlet 17, an additional tapered opening 22 ismade forming in eflect a valve seat, associated with, which is a taperedpin 23 enlarged at its outer end and threaded so that it may be adjustedtoward and away from the seat, provided at 22. The screw threadedportion of'the pin 23 is notched or slotted longitudinally, as indicatedat 24, whereby passages are provided for the escape of air outwardlypast the pin 23; and this escape may be regulated as to volume andamount by different adjustments of the pin 23 as is obvious. An inletopening 25 is made through the valve casing 13 in substantial alignmentwith the passage 15 before described and at the opposite side of thecasing. A pipe 26 for carrying compressed air is screwed at one end intothe casing, joining with said opening or passage 25, and at its oppositeend is connected with a second valve casing 27 having an inlet withwhich a pipe 28 is connected for carrying compressed air' from a mainsupply tank of air. A horizontal web 29 with openings therethrough isformed integral with and located within the valve casing, above which amovable valve member 30, alsohavingopenings therethrough is located, thesame being pinned to a vertical shaft 31 which extends upwardly throughthe upper side of the valve casing 27 and through a suitable stufiingbox for preventing the escape of the air, as shown. By turning the rod31 manually to one position the openings in the web 29 and the valvemember 30 are in conjunction and air can flow through the casing 27. Butwhen turned to another position the openings making passages for the airare closed and the compressed air is kept from passing through the valvecasing 27 as is evident.

Within the valve casing 13 a vertically movablfevalve 32 is located,having a rod 33 connected at its upper end, the same extending upwardlythrough the upper end of the casing 13. The valve 32 has a passage 33made vertically from its lower end to the rod 33. A short distance abovethe lower end of valve 32 a relatively wide and deep annular groove 32is cut around the valve and on the inner side of the valve, that is, theside toward the cylinder 2 of the machine, a vertical groove or,passageway 34 is formed, the same extending from a short distance belowthe upper end of the valve 32 to a short distance above the annulargroove 32*. In

' one position of the valve, as shown in Fig. 4,

this passage 34 joins the inlet passage 15 with an opening 35 madethrough the side of the valve casing a short distance above said openingor passage 15; and in another opposite position, that shown in Fig. 3where the valve 32 is elevated, said passage 34 is elevated suflicientlythat the connection between the passages 15 and 35 is broken, while insuch elevated position the groove 32 is-located in the same plane withthe aligned passages 25v from twisting by its sliding engagement with arigid vertical rod 39 which passes through a projecting free end of thebar 39. At its opposite end bar 39 is connected with a link 40 which, inturn, is connected with oneend of a lever 41 pivotally mounted betweenits ends on a stub shaft 42, carried by an arm 43 integrally cast withand extending upwardly from the valve casing 13. A ratchetwheel 44,having a plurality of ratchet teeth, is loosely mounted on the stubshaft 42 and at one or morepoints between certain of the ratchet teethis formed with deep cut notches 45 which are deeper than the notches cutin forming the regular teeth on the wheel. An arm 46 is also looselymounted on the stub shaft 42, both the ratchet-wheel and arm 46 beingdisposed between the support 43 and the lever 41. Lever 41 extendsbeyond the ratchet-wheel and is equipped with a pivotally mounted springactuated pawl 48, the end of which engages with the ratchet-wheel asshown, while a dog 49 is pivotally mounted on the support 43 beingspring actuated to engage with the ratchet-wheel at a point nearlydiametrically opposite the point of engagement of the pawl 48 therewith.The dog 49 is for the purpose of holding the ratchet wheel againstreturn rotation. Arm 46 at its upper end is extended a short distanceoutwardly and terminates in a nose 47 under which the pawl 48 may engagewhen it is:-

seated in a notch 45, but over which the pawl passes when engaged in anyof the other notches between the teeth of the ratchetwheel. 9

A connecting rod 50 has pivotal connection at one end with the outer endof arm 46 andat its opposite end to an arm 51 fixedly secured to the rod31 This is best shown in Fig. 2.

After the flask and pattern has been placed in position and the flaskfilled with sand the rod'31 is manually operated so as to move the valvemember 30 into position such that the compressed air may flow free- 1ythrough the valve casing 27, the pipe 26 and passage 25 and thencethrough lateral opening 36 to the vertical passage 33 in valve member32, the valve being in the position shown in Fig. 4. The compressed airunder such circumstances passes downwardly through the passage 33 andthe branches shown at the lower end thereof coming under the valve andcausing it to be elevated to the position shown in Fig. 3. In thisposition the annular groove 32 around valve 32 joins passages 25 and 15so that the air may pass in considerable volume to and underneath thepiston 5. This causes an elevation of the pistons 5 and at and theflask, pattern and mold carried thereon until the piston passes abovethe outlet opening 19 which is joined with the hose connection 18,whereupon compressed air flows through said hose 18 and the opening 17into the valve casing 13 above the upper end of the valve As a resultthe valve 32 is driven downwardly to lowerposition, that shown in Fig.it, and the air under the piston 5 has a free outward passage throughthe passages 16, 15, 3% and 35, exhausting to the outside atmosphere. Inthe meantime or as soon a the passage 19 is again completely-covered bya side of the piston 5 on its downward movement, the air again flows tothe passage 33 to and in under the lower end of valve 32, causing it toagain rise. The cycle of operations'is thus repeated and continues untilit is automatically stopped by a construction for such purpose, theoperation of which will be later described. It is evident that the airwhich is above the valve 32 on the upward movement of said valve escapesoutwardly through the passage 22 and that which is below the lower endof the valve escapes outwardly through the passages 37,

38 and 21 when the valve is moved tolower position.

Vith each reciprocation of the valve 32 the bar 39 is raised and loweredwith a consequent turning of the lever 41 back and forth on the stubshaft 42. Pawl 48 turns the ratchet-wheel one step on the downwardmovement of the valve and slips back over a tooth of the ratchet-wheelon each upward movement of the valve. This continues until the pawlreaches one of the deeper cut notches 45, whereupon with the nextturning movement of the ratchet-wheel, the end of the pawl 48 engagingunderneath the nose a? causes the arm 46 to swing about the axis of thestub shaft 42 witha consequent turning of arm 51' by reason of theconnection made bv the connecting rod 50. When this occurs, the valvemember at 30 is moved to close the passages for compressed air throughthe valve casing27, and the operation of the machine is automaticallystopped until such time as the rod 31 is again turned manually. Theeffect of this manual turning of the rod 31 in opening the valve at 29and 30 is to; at the same time, swing the arm 46 (see Fig. '1' in aclockwise direction, whereupon the no se a7, at the upper end of thearm. bearing again'stthe upper point of pawl 48, .forces the samedownwardly and outwardly, the

for green sand molds.

pawl riding against the lower edge of the notch 45 in which it isseated, and lever 41 succeeding deeper cut notch 4.5 reaches the pawlt8. In practice the number of notches 15 in a ratchet-wheel 44: may beas many as desired. In Fig. 8, a ratchet-wheel is shown with three ofthese notches while in the remainder of the figures the ratchet-wheel isshown with but one of said deeper notches, it being evident that withthe latter form of ratchet-wheel the cylinder carrying the flask,pattern and mold is operated up and down, before stopping, as manv timesas there are notches in the ratchet-wheel; while with a ratchet-wheellike that shown in Fig. 8 it is operated only one-third as many timesbefore stopping.

\Vith this construction the flask and mold may be raised and loweredrepeatedly and thereby jarred until the sand has been condensed to therequired and proper density so that with a subsequent squeezingoperation performed following such vibration and jarring, the mold willbe of proper character The operation is entirely automatic except forthe one manual operation of starting the machine in motion, that is byturning the rod 31 to open the valve within the valve casing 27. Themovement of the ram or cylinder is fairly rapid and a flask filled withsand may be tamped and condensed with considerable speed. .The

and is to be considered as comprehensive of all forms of structurecoming within their scope.

I claim:

1. In a machine of the class described, a cylinder, a piston mounted forreciprocation therein, an automatic valve having a reciprocable memberfor the purpose of alternately admitting air into the cylinder below thepiston and exhausting the air therefrom to cause reciprocation of thepiston in the cylinder, an air supply pipe communicating with saidautomatic valve, and means actuated by said reciprocable member forstopping the passage of air to the cylinder after the reciprocablemember has moved a predetermined number of times. Y

a 2. In a machine of the class described, a cylinder, a piston mountedfor reciprocation therein, an automatic valve having a reciprocablemember for the purpose of alternately admitting-air into the cylinderbelow the piston and exhausting the air therefrom to cause reciprocationof the piston in the cyl piston and exhausting the air therefrom tocause reciprocation of the piston in the cylinder, an air supply pipecommunicating with said automatic valve, a valve in the air supply pipeadapted to be manually opened, a ratchet wheel having a deep recess atone point between two of its teeth, a lever oscillated by said reciprocable member, a pawl mounted on said lever to engage the ratchetwheel, a pivoted arm having an extension.

to be engaged by said pawl when the pawl is in the said deep recess ofthe ratchet wheel, and means connecting said arm with said valve wherebythe valve is closed when the arm is moved by engagement of the pawl withthe extension on the arm.

4. In mechanism of the character described, a vertical cylinder, apiston mounted for reciprocation therein, an air conduit for carryingcompressed air to the lower end of the cylinder below the piston, amanually operable valve for opening said conduit for the passage ofcompressed air therethroug-h, air operated means movably mounted andextending across said air conduit, said air operated means being movableto two positions in one of which there is free passage of air to thecylinder and in the other of.

which such passage is closed and an exhaust passage for air outwardlyfrom the cylinder opened, and means operated by said air operated meansfor operating the manually operable valve to closing positionafter apredetermined number of operations of said air operated means. r

5. In combination, a vertical cylinder, a piston mounted therein, meansfor conducting compressed air to the cylinder below the lower end of thepiston, a valve in said air conducting means for manually controllingthe passage of air, means located in said air conducting means betweenthe valve and the cylinder for automatically controlling the passage andexhaust of air to and from the cylinder,.and means operated by said lastnamed means and connected with said valve for automatically moving thesame to closed position after a predetermined number of reciprocationsof the piston in the cylinder made by said passage of air to and exhaustfrom the cylinder, substantially as described.

6. In a construction o'tthe class described, a vertical cylinder, apiston mounted for reciprocatory movements therein, an air conduit forcarrying compressed air to the lower end of the piston, a reciprocatingvalve mounted across said air conduit, a manually operable valve locatedin saidair conduit beyond the reciprocating valve, means for carryingair to one end of the reciprocating valve to move it in one direction toa position in which air may pass freely to the cylinder and elevate thepiston, means for carrying air from said cylinder to the opposite end ofsaid reciprocating valve after the piston has been elevated apredetermined amount, thereby forcing the valve in the oppositedirection wherein the passage of air to the cylinder is blocked and anexhaust for air from the cylinder is opened, the piston dropping bygravity, and means operated by the reciprocat-ions of said reciprocatingvalve connected with said manually operable valve for closing themanually operable valve after a predetermined number of reciprocationsof the reciprocating valve, substantially as described.

7. In a machine of the class described, a table mounted forreciprocation, fluid operated means to reciprocate said table, aofluidsupply pipe communicating with said recip rocating means, a valve insaid fluld supply pipe adapted to be manually opened, a ratchet wheelhaving a deep recess between two of its teeth, a lever oscillated ateach reciprocation.

of said table, a pawl mounted on said lever toengage the ratchet wheel,a member adaptedto be engaged by said pawl when the pawl is in the saiddeep recess of the ratchet wheel and means connecting said member withsaid valve whereby the valve is closed when the member is moved byengagement of the pawl.

In testimony whereof I ailix my signature.

DONALD J. CAMPBELL.

